接到一个任务，该任务需要从数据支持部的FTP上下载4个文件。
数据支持部的同事给了4个工具分别用下来载这4个文件
因为每天要定时下载，所以加入了计划任务。
这样一来，本可以做为一个任务来完成的东东却硬被分成了4个任务，
这还不是大问题，最大的问题是如果要下载的文件名规则有了变化，我就要分别改这4个工具的配置文件。
这4个工具虽能满足要求，但有点烦琐。看来还是不能偷懒了 - -
自己用FtpWebRequest来实现吧
下载文件

/// <summary>
        /// 下载文件
        /// </summary>
        /// <param name="filename"></param>
        private static void DownLoadFile(string filename)
        {
            FtpWebRequest req = (FtpWebRequest)WebRequest.Create("ftp://" + FtpAddress + "/" + filename);
            req.Method = WebRequestMethods.Ftp.DownloadFile;
            req.UseBinary = true;
            req.UsePassive = true;
            req.Credentials = new NetworkCredential(FtpUid, FtpPwd);
            try
            {
                using (FtpWebResponse res = (FtpWebResponse)req.GetResponse())
                {
                    string localfile = Path.Combine(LocalPath, filename);
                    FileStream fs = new FileStream(localfile, FileMode.Create, FileAccess.Write);
                    int buffer = 1024;  //1K缓冲
                    byte[] b = new byte[buffer];
                    int i = 0;
                    Stream stream = res.GetResponseStream();
                    while ((i = stream.Read(b, 0, buffer)) > 0)
                    {
                        fs.Write(b, 0, i);
                    }
                }
                Console.WriteLine(filename + " download!");
                Log(filename + "下载成功");

            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.ToString());
                Log(ex.ToString());
            }
            finally
            {

            }
        }

获取文件列表

/// <summary>
        /// 获取FTP文件列表
        /// </summary>
        /// <returns></returns>
        private static List<String> GetFileList()
        {
            List<string> list = new List<string>();
            FtpWebRequest req = (FtpWebRequest)WebRequest.Create(new Uri("ftp://" + FtpAddress + FtpRemotePath));
            req.Credentials = new NetworkCredential(FtpUid, FtpPwd);
            req.Method = WebRequestMethods.Ftp.ListDirectory;
            req.UseBinary = true;
            req.UsePassive = true;
            try
            {
                using (FtpWebResponse res = (FtpWebResponse)req.GetResponse())
                {
                    using (StreamReader sr = new StreamReader(res.GetResponseStream()))
                    {
                        string s;
                        while ((s = sr.ReadLine()) != null)
                        {

                            list.Add(s);
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.ToString());
                Log("下载文件列表失败:");
                Log(ex.ToString());
            }
            return list;

        }

上传文件

private static void UploadFile(string localFile)
        {
            FileInfo fi = new FileInfo(localFile);
            FileStream fs = fi.OpenRead();
            long length = fs.Length;
            FtpWebRequest req = (FtpWebRequest)WebRequest.Create("ftp://" + FtpAddress + FtpRemotePath + fi.Name);
            req.Credentials = new NetworkCredential(FtpUid, FtpPwd);
            req.Method = WebRequestMethods.Ftp.UploadFile;
            req.UseBinary = true;
            req.ContentLength = length;
            req.Timeout = 10 * 1000;
            try
            {
                Stream stream = req.GetRequestStream();
                
                int BufferLength = 2048; //2K
                byte[] b = new byte[BufferLength];
                int i;
                while ((i = fs.Read(b, 0, BufferLength)) > 0)
                {
                    stream.Write(b, 0, i);
                }
                stream.Close();
                stream.Dispose();
                
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.ToString());
            }
            
        }

记录一下